misc: Fix clippy error from beta compiler

Rust has a new way of constructing other error and clippy complains if
we are still using the older way to construct error message. Thus,
migrate to the new approach suggested by the clippy.

Warning from beta compiler:

error: this can be `std::io::Error::other(_)`
--> block/src/vhdx/mod.rs:142:17
 |
 | /                 std::io::Error::new(
 | |                     std::io::ErrorKind::Other,
 | |                     format!("Failed to update VHDx header: {e}"),
 | |                 )
 | |_________________^
 |
 = help: for further information visit
https://rust-lang.github.io/rust-clippy/master/index.html#io_other_error
help: use `std::io::Error::other`

                 std::io::Error::other(
                     format!("Failed to update VHDx header: {e}"),

Signed-off-by: Jinank Jain <jinankjain@microsoft.com>

net_util/src/mac.rs

@@ -25,10 +25,10 @@ impl MacAddr {
     {
         let v: Vec<&str> = s.as_ref().split(':').collect();
         let mut bytes = [0u8; MAC_ADDR_LEN];
-        let common_err = Err(io::Error::new(
-            io::ErrorKind::Other,
-            format!("parsing of {} into a MAC address failed", s.as_ref()),
-        ));
+        let common_err = Err(io::Error::other(format!(
+            "parsing of {} into a MAC address failed",
+            s.as_ref()
+        )));
 
         if v.len() != MAC_ADDR_LEN {
             return common_err;
@@ -39,10 +39,11 @@ impl MacAddr {
                 return common_err;
             }
             bytes[i] = u8::from_str_radix(v[i], 16).map_err(|e| {
-                io::Error::new(
-                    io::ErrorKind::Other,
-                    format!("parsing of {} into a MAC address failed: {}", s.as_ref(), e),
-                )
+                io::Error::other(format!(
+                    "parsing of {} into a MAC address failed: {}",
+                    s.as_ref(),
+                    e
+                ))
             })?;
         }
 
@@ -64,10 +65,11 @@ impl MacAddr {
     #[inline]
     pub fn from_bytes(src: &[u8]) -> Result<MacAddr, io::Error> {
         if src.len() != MAC_ADDR_LEN {
-            return Err(io::Error::new(
-                io::ErrorKind::Other,
-                format!("invalid length of slice: {} vs {}", src.len(), MAC_ADDR_LEN),
-            ));
+            return Err(io::Error::other(format!(
+                "invalid length of slice: {} vs {}",
+                src.len(),
+                MAC_ADDR_LEN
+            )));
         }
         Ok(MacAddr::from_bytes_unchecked(src))
     }